geopandas error "minimums more than maximums"

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I posted this question on stackoverflow here, but it seems that gis.stackexchange is the more appropriate platform.

I am trying to merge two geodataframes in geopandas (want to see which polygon each point is in).

The following code gets me an error ("RTreeError: Coordinates must not have minimums more than maximums").

I cannot find any explanation as to what this means and how to solve it. Any ideas?

import geopandas as gpdfrom shapely.geometry import Point, mapping,shapefrom geopandas import GeoDataFrame, read_file#from geopandas.tools import overlayfrom geopandas.tools import sjoinprint('Reading points...')points=pd.read_csv(points_csv)points['geometry'] = points.apply(lambda z: Point(z.Latitude, z.Longitude), axis=1)PointsGeodataframe = gpd.GeoDataFrame(points)print PointsGeodataframe.head()print('Reading polygons...')PolygonsGeodataframe = gpd.GeoDataFrame.from_file(china_shapefile+".shp")print PolygonsGeodataframe.head()print('Merging GeoDataframes...')merged=sjoin(PointsGeodataframe, PolygonsGeodataframe, how='left', op='intersects')#merged = PointsGeodataframe.merge(PolygonsGeodataframe, left_on='iso_alpha2', right_on='ISO2', how='left')print(merged.head(5))Link to data for reproduction:Shapefile,GPS points



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